>>40950281
Indra defeats Vritra, the great dragon, by striking him with the Vajra. The Vajra is represented by the thunderbolt and it brings transformative change, the Vajra is also a symbol of polar unity, symbolized by the sun and moon disc.
The Vajra represents the same thing that the Ankh does, and Vritra is Typhon. Typhon swallows the soul and forces them into rebirth.